Cachet/config/cachet.php

<?php

/*
 * This file is part of Cachet.
 *
 * (c) Alt Three Services Limited
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

return [

    /*
    |--------------------------------------------------------------------------
    | Cachet Timezone
    |--------------------------------------------------------------------------
    |
    | The timezone Cachet uses for converting timezones on saving.
    |
    */

    'timezone' => 'UTC',

];